Checking Control Module Communication

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition on.
Wait approximately 5 seconds. It takes approximately 5 seconds before the control module can update the different functions.
Check the control module is functioning by checking control of damper motor recirculation or damper motor air distribution. Listen to the motor or visually inspect the damper motor and its linkage.

To access/replace the damper motor, refer to Replacing Damper Motor Recirculation (Damper motor switch air distribution) and Replacing Damper Motor Air Distribution Damper Motor Position Sensor recirculation.

Check that the REC button LED is functioning by engaging and disengaging the REC function. If the control module controls the motors correctly and the LED is OK this indicates that the control module is functioning.

Is the control module functioning?

YES
FAULT NOT FOUND: Troubleshooting has been completed.
NO
Refer to Checking Power Supply And Ground For MCC Control Module